/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.imaging.formats.tiff.photometricinterpreters;

import java.io.IOException;

import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.ImageBuilder;

public class PhotometricInterpreterPalette extends PhotometricInterpreter {
    private final int[] fColorMap;

    /**
     * The color map of integer ARGB values tied to the pixel index of the
     * palette
     */
    private final int[] indexColorMap;

    public PhotometricInterpreterPalette(int fSamplesPerPixel,
            int fBitsPerSample[], int Predictor, int width, int height,
            int[] fColorMap) {
        super(fSamplesPerPixel, fBitsPerSample, Predictor, width, height);

        this.fColorMap = fColorMap;

        int fBitsPerPixel = bitsPerSample[0];
        int colormap_scale = (1 << fBitsPerPixel);
        indexColorMap = new int[colormap_scale];
        for (int index = 0; index < colormap_scale; index++) {
            int red = (fColorMap[index] >> 8) & 0xff;
            int green = (fColorMap[index + (colormap_scale)] >> 8) & 0xff;
            int blue = (fColorMap[index + (2 * colormap_scale)] >> 8) & 0xff;
            indexColorMap[index] = 0xff000000 | (red << 16) | (green << 8)
                    | blue;
        }

    }

    @Override
    public void interpretPixel(ImageBuilder imageBuilder, int samples[], int x,
            int y) throws ImageReadException, IOException {
        imageBuilder.setRGB(x, y, indexColorMap[samples[0]]);
    }
}
